In shozsell website at top of each page there is a Login or register link. By clicking that link you will be redirected to registration page. There is some required input field. You must fill out those field by providing valid information and tap the submit button then you will be the valid register member.
You can also create account by using Facebook and Gmail. Click the corresponding button that shown in the bottom of the form then it will be ask permission for accessing your corresponding account. If you granted this then automatically you will be the register member.